Release 0.1.52

What's Changed

• Bump pygithub from 2.5.0 to 2.8.1 by @dependabot[bot] in #159
• Minor fix up of types and fix a couple of Bugs by @marcpage in #161
• Release 0.1.52 by @marcpage in #162

Full Changelog: v0.1.51...v0.1.52